Adjustable Duck Bill Nipple Clamps. Adjustable duckbill curved nipple clamps are great if you love the feel of smooth, cool metal on your sensitive skin. A sleek, shiny look. Jewel chain. Non-piercing nipple clamps with duck bill ends. Spartacus A Passion for Quality Catalog page 6. Categories: Bondage, Fetish, Kink, Nipple Play, Pasties, Accessories, Bondage Kits, Kinky Sets. 2022.